Improvement in the methods of banding compressed wood



CHARLES B. GILMAN, 0F BROOKLYNNEW YORK.`

Letters Patent No. 113,044, dated March 28, 1871.

IMPROVEMENT |N THE METHODS OF BNDING COMPRESSED WOQD.

The' Schedule referred to in these Letters Patent and making part of the same.

I, CHARLES B. GILMAN, of Brooklyn, in the county of Kings andState of New York, have invented an Improved Method of vBanding Compressed -Wood and Apparatus for the purpose, of which the following is a specification. 1

For many purposes, such as wagon-hubs, tool-handles, wooden rolls, and the like, compressed wood possesses advantages over other material, and it is important that such should be banded while in a, state of compression, before any expansion occurs. o

My invention relates to the application of bands to the wood while under the influence ot' the compressing force to prevent'lany expansion which might occur when it is released; and lin the employment for that purpose of a sectional die or dies-provided to receive the bands, into which dies the wood is forced in its compressed state; or the saine may also be used in l combination with the requisite power to produce compression. 1

As represented in the drawing- Figure 1 is an elevation of-a machine for compressing and banding wood, the principal portionsbeiug Shown in section.

Figure 2 is a plan or end view of the sectional .die removed.

Figure 3 is an elevation of a block or cylinder of wood with the bauds applied and representing the 'sections of the die separated for its removal.

v The usual method employed for compressing cylinders of wood iste force the same through conical dies by hydrostaticor other power.

Arepresents the top and base, and

B B, the connecting-columns of a press for this purpose, in which G is the movable piston of a hydraulic pump.

D, the conical compressing-die, which is forced upward, by the action of the piston,- through the iutervening parts presently to be described.

The block'to be compressed is placed in the position, shown by the dotted lines e e, where it is held by the transverse frame A, and forced to enter the conical opening of the die D as it rises.

Intervening between the piston-head or platen is a cylindrical die, O, composed of sections, ff f, the aperture.l of which corresponds in diameter with that of the lower extremity of the compressing-die D.

An annular recess or rebate, t t, is formed at either end of the cylindrical opening, `of suficient size' to receive each a metal band of the requisite strength.

The lower surface of the die D is recessed to receive the top of the sectional die, andthe platen or follower G is provided with a corresppnding recess, by which the sections composingr the'die are held together.

The operation'is as follows:

The sectional die is placed upon the platen or fol-r lower G, with metallic bands in the recesses t the interior diameter of which corresponds precisely with that of the die, the compressing-die D resting upon the top thereof, and serving, with the platen G, to hold the several parts in their place.

The block to be compressed being placed in position, by the upward 'movement of the pistou C is4 forced to enter the die D; the stroke of the piston is then retracted, lowering the die, so that asui'table follower may be placed above the ,partiallycompressed block, when the dies are again moved upward, the

lfollower forcing the block H downward until it passes the compressing-die D and occupies the'space within the' sectional die f f f.

The two dies and theblock all being of uniform lengths, the ends of the latter are inclosed by the bauds, previously placed in the recesses t t, which fit them tightly. Y

rIhe platen G is then lowered sufficiently to release the top ,of the sections f f f.from their seat in the die D, when ythey separate freely,'as shown vin iig. 3, permitting the compressed and banded block H to be removed. v

The sections may be sustained by a' suitable support Iin a convenient position when the block is being removed.

The bands are in this manuel` applied while the wood isheld by the force used,A in itscompression, so that Yno expansion "previous to banding can occur,'.and no additional power or expense is required to apply the bands.

Itecesses may be provided in the sectional die'O for any number of bands which may he required.

In some cases it may be found more convenient to reverse the position ofthe dies, placingthe sectional die 0 aboveithe compressing-die below it, and the.

block to. be compressed directly upon, the platen or piston-head,y in which case a recess or ring for re-v taining the sections in position, like that described, is required upon the tcp transverse lframe-piece A.

Vhat I claim asmy invention is 1. A die composed of two or more sections` f f f, and provided with recesses t t for the reception'of the bands, substantially as and for the purpose set forth.

2. The combination of the sectionaldie Ol with the compressing-die D, substantially in the m'tnner andl 

